Shook stop for box nailing machines



July 26, 1932.

F. CHEKlAN 1,868,885 SHOOK STOP FOR BOX NAILING MACHINES Filed. May 17, 1950 2 Sheets-Sheet 1 all we, wen Z/zd side skunk is 15602 mailed ATTORNEY July 26, 1932. F, H 7 1,868,885 SHOCK STOP FOR BOX NAILING MACHINES Filed May 17, 1930 2 Sheets-Sheet 2 INVENTOR Frank C12 elf 6m Patented July 26, 1932 FRANK CHEKIAN, F MODESTO, CALIFORNIA SHOCK STOP FOR BOX MAILING MACHINES Application filed May 17,

This invention relates to the making of boxes, and particularly to those relatively light boxes in which certain fruits, raisins and the like are packed for the retail trade.

Such boxes are now generally made with the aid of a nailing machine which is provided with means to hold the relatively heavy end boards of the box in an upright position; the thin shook used for the sides and bottom of 10 the box being each successively located and held in place by hand in connection with the end boards, while the operator depresses the pedal which controls the nailing mechanism and by which all the necessary nails are driven through the shook and into the end boards.

It is necessary for the proper appearance and making of the box that the side shook particularly shall be accurately alined with the end boards. Owing to the fact that the horizontal plane of the bottom and side shook when associated with the machine is the same, and that the bottom shook projects inwardly from the front of the machine a greater distance than the side shook, an immovable back stop can be used for locating the former but not for the latter, since this would interfere with the positioning of the bottom shook, as will be evident. The necessary alinement of the side shook with the end boards is now therefore generally accomplished by engaging the shook at both ends and lining up the corresponding edges of the shook and end boards with the fingers, and holding the shook immovable while the nailing mechanism is operated. Not only'is there a possibility that the light shook will slip from position before it is nailed, but owing to the close proximity of the outermost nails to the points where the shook is engaged by the fingers it sometimes happens that the fingers are caught by the nails or mashed by the nailing head of the machine.

The principal object of my invention therefore is to avoid this sometimes inaccurate and relatively slowand unsafe method of locating the side shook in place, by providing a back stop for the same, so positioned that when the back edge of a shook is'engaged with the stop, the" front edge of the shook 1930. Serial No. 453,183.

will properly aline with the adjacent edges of the end boards. However the stop is soarranged in connection with the operating mechanism of the nailing machine that said stop will be automatically raised only when 55 the side shook is to be placed, and will be automatically lowered or moved out of the way when the bottom shooks are being placed and nailed. Not only therefore are the individu :11 side shooks more accurately and easily co lined up than is now possible, but operations are considerably expedited so that the output of a worker may be greater with no greater expenditure of labor on his part; and with no danger of harm to the operator since there is (so no longer the need of his holding the shook adjacent. the zone of nails.

A further object of the invention is to produce a simple and inexpensive device and yet one-which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in several views:

Fig. 1 is a fragmentary front elevation ofa nailing machine showing the box-end supporting elements of the machine in connection with the backstop member; the box parts being in a position to nail a side shook and the back stop being in its raised position to be engaged by said shook.

Fig. 2 is a top plan view of the stop oper ating cam and the lower end of the back stop unit, showing the position of the parts corresponding to that in Fig. 1.

Fig. 3 is a view similar to Fig. 1 showing the box parts positioned to nail the bottom shook and with the back stop lowered to avoid contact with said bottom shook; the side shook already placed being shown partly broken away.

Fig. 4 is a view similar to Fig. 2 showing the position of the cam corresponding to that in Fig. 3.

Fig. 5 is a side elevation of the back stop unit shown engaged with the cam and raised.

Fig. 6 is a top plan view of a modified form of upright cam.

Referring now more particularly to the characters of reference on the drawings, the nailing machine, which is one of standard make, includes longitudinal frames 1 from which opposed vertical posts 2 project upwardly, These posts support upper and lower horizontal bars 3 and 4 respectively which extend transversely of the machine and are horizontally offset from each other lengthwise of the machine. These bars form ledges ada ted to engage and support the edges of the ox ends 5 when set in horizontal and vertical positions respectively; and are so spaced apart vertically relative to the height and width of said box ends that the uppermost edges of the latter when thus supported are on a common level. When thus supported the said box ends are held firmly in an upright position by opposed guide bar units 6 which extend transversely of the machine a certain distance above the bars 3 and are supported from a horizontal shaft 7 disposed at the back of the machine. Between the posts a vertical shaft 8 depends from the frame 1 and is connected by gearing 9 to the nailing mechanism of the machine (not shown). The posts are mounted for movement to and from each other so as to alternately place the ledges 3 and 4 in vertical alinement with the spaces between the guide units 6 (which determine the length of the box), such movement being controlled by a cam 10 mounted on the shaft 8 just below the frame 1. In the functioning of the machine each nailing operation causes a subsequent one-third rotation of the shaft 8 to take placea feature which I utilize in connection with the operation of my back stop unit, as will now be seen.

The above parts are all standard on a certain type of nailing machine and I do not change the same in any way in mounting my back stop unit in connection therewith. This unit comprises a rigid vertical support 11 projecting upwardly from the back frame 1 and having a base flange 2 to rest on said frame; said flange being provided with a slot 13 extending transversely of the machine and through which a securing bolt 14 passes. This arrangement enables the position of the support relative to the front of the machine to be adjusted somewhat so that the desired accuracy of location of the back stop, which is mounted in connection with said support, may be obtained. The support is provided at its upper end with a vertical sleeve 15 in which a stem 16 is slidably but non-turnably mounted; the upper end of the stem rigidly supporting a depending back stop plate or flange 17 whichextends in front of the stem for nearly the full distance between the guide units 6. The lower end of the stem carries a roller 18, whose axis isradial with the shaft 8 and which is adapted to ride on a cam 19 fixed on the upper end of the shaft 8, or just above the top level of the frames 1. The leading edge of this cam slopes downwardly as at 20, so as to engage and gradually raise the roller; the downward movement of the stem when the roller is clear of the cam being limited by a vertically adjustable collar 21 on the stem above and engageable with the sleeve 15. When the collar is thus engaged with the sleeve the top level of the back stop plate is lower than the under edge of the bottom shook 22 which rests on and extends between the end boards 5, as shown in Fig. 3. When the roller rides on and is lifted by the cam theback stop plate is raised above the level of the upper face of the side shook 23 so as to be engaged thereby, as shown in Fig. 1. The back plate is so disposed transversely of the machine that when the box ends are upended and resting on the ledges 4, and are engaged with the backstops 24 provided in connection with said ledges the back stop plate will engage the side shook so that the front edge of the same is lined up with the front edges of the box ends, as is required.

In the operation of the machine the box ends are first upended and supported on the ledges 4, so as to enable one of the side shooks to be secured thereto. The cam is so fixed on the shaft 8 that with this position of the ledges 4 the roller is riding on the cam, adjacent its rear or following end, as shown in Fig. 2, and the back stop plate is raised to engage the side shook. In locating the said shook in connection with the box ends it is only necessary to grasp the same adjacentthe middle, push it back until it abuts against the back stop; additional locating means to positively insure the proper positioning of the shook being provided in the form of fingers 25 upstanding from the outermost member of the left-hand guiding unit. The nailing mechanism is then operated and the side shook is nailed to the box ends. The box unit consisting of the box ends with the side shook secured thereto is then withdrawn from the original position, whereupon the posts 2 automatieall I move into to place the ledges 3 in vertical alinement with the space between the guide units. Such movement of the posts is accompanied by a rotation of the shaft 8 through an arc of 120 degrees, or through a one-third revolution, so that the roller then clears the cam and the back-stop plate is lowered. ,The cam then assumes a position relative to the stop, as shown in Fig. 4. Said box ends are then placed lengthwise on the ledges 3, as shown in Fig. 8, with the side shook already secured facing to the front, and the bottom shooks are placed thereon in position for nailing. As above stated, the back stop plate is now lowered and does not interfere with the placing of these shooks. Following the subsequent all functioning of the nailing mechanism, to nail these shooks to the box ends, the shaft 8 is again rotated through a one-third revolution and the cam again engages and raises the roller, causing of course an accompanying raising of the back stop plate. The roller then occupies a position on the cam adjacent its leading edge, while the members 2 are again shifted outwardly to aline the ledges a with the box ends.

The partially completed box is then withdrawn and inverted in position so as to enable the final side shook to be nailed in place. The back stop plate having been again raised as above described it is again in position to engage the side shook. With the subsequent nailing operation the box is completed and the machine is in position to start on another one. Subsequent to this last nailing operation the shaft 8 is of course again rotated through one-third of a turn but the cam still engages the roller, since the arcuate length of the cam is greater than. 120 degrees. In other words said cam now occupies the '2 same position as at the outset of operations,

or as shown in Figs. 1 and 2.

The above described type of cam is particularly used for what is known as lug boxes, in which the side shock of both sides must be engaged by the back stop. For raising boxes and the like, it is only desirable or nec essary to have one side shook engaged with the back stop, as is well known to the workers in the industry. For use in connection with this type of business I have provided the type of cam shown at 19a in Fig. 6 in which the roller engaging surface of the cam is of only sufficient length to support the roller of the back stop unit for just one periot during the cycles of revolution of the shaft.

From the foregoing description it will be readily seen that I have produced such a device as will. substantially fulfill the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A back-stop structure for the side shook of a box when assembling such shook in connection with the box ends in a nailing machine, said machine including supports for the box ends and a shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back-stop structure including a back-stop plate positioned for engagement with the back edge of the shook when resting on the supported box ends, means mounting said plate for vertical movement,

and means functioning with a partial revolution of the shaft for moving said back-stop vertically and clear of the horizontal plane of the shook.

2. A back-stop structure for the side shook of a box when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the box ends and a shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back-stop structure including a bao I-SQOP plate positioned for engagement with the back edge of the shock when resting on the supported box ends, means mounting said plate for vertical movement, and means functioning with a partial revolution of the shaft for causing said back-stop to be lowered clear of the horizontal plane of the shook.

3. A back-stop structure for the side shook of a box when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the box ends and a shaft revoluble through a. predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back-stop structure inciuding a back-stop plate positioned for engagement with the back edge of the shook resting on the supported box ends, means mounting said plate for vertical movement, and means functioning with a partial revolution of the shaft for causing said backstop to be lowered clear of the horizontal plane of the shook, and for again raising the back stop with a subsequent partial revolu tion of the shaft.

4. A back-stop structure for the side shook of a box when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the box ends and a vertical shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back stop structure including a vertically movable back-stop plate positioned for engagement only when raised, with the back edge of the shook when resting on the supported box-ends, a cam fixed on the upper end of the shaft, and means between the cam and back-stop plate for raising the latter by a certain partial revolution of the shaft and for holding said plate raised until a further partial revolu tion of the shaft takes place.

5. A back-stop structure for the side shook of a box when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the box ends and a vertical shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back stop structure including a vertically movable back-stop plate positioned for engagementwhen raised With the back edge of the shook when resting on the supported box-ends, a stem depending from the plate and supporting the same, aslidebearing for the stem, and a cam fixed on the upper end of the shaft adapted to engage and raise the stem with a certain partial revolution of the same.

6. A back-stop structure for the side shook of a boX when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the boX ends and a vertical shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine; said back-stop structure including a vertically movable back-stop plate positioned for engagement when raised with the back edge of the shook when resting on the supported box-ends, a stem depending from the plate and supporting the same, a fixed sleeve in which the stem is freely slidable, said stem tending to drop of itself, means limiting the lowering movement of the stem, the plate being then below the level of the shook, and a cam fixed on the shaft and which the stem overhangs; said cam being arranged to engage and raise the stem from its lowered position once during every full revolution of the shaft a distance suflicient to raise the plate above the level of the shook.

7. A back-stop structure for the side shook of a box when assembling such shook in connection with the box-ends in a nailing machine, said machine including supports for the box ends and a shaft revoluble through a predetermined partial revolution with each functioning of the nailing mechanism of the machine, said back-stop structure including a stop element positioned for engagemment with the back edge of the shook when said shook is resting on the supported box ends, means mounting said element for movement clear of such engaging position, and means functioning with a partial revolution of the shaft for thus positively 1novin said stop element.

n testimony whereof I affix my signature.

FRANK CHEKIAN. 

